<?php
/**
* WP_Theme Class
*
* @package WordPress
* @subpackage Theme
* @since 3.4.0
*/
#[AllowDynamicProperties]
final class WP_Theme implements ArrayAccess {
/**
* Whether the theme has been marked as updateable.
*
* @since 4.4.0
* @var bool
*
* @see WP_MS_Themes_List_Table
*/
public $update = false;
/**
* Headers for style.css files.
*
* @since 3.4.0
* @since 5.4.0 Added `Requires at least` and `Requires PHP` headers.
* @since 6.1.0 Added `Update URI` header.
* @var string[]
*/
private static $file_headers = array(
'Name' => 'Theme Name',
'ThemeURI' => 'Theme URI',
'Description' => 'Description',
'Author' => 'Author',
'AuthorURI' => 'Author URI',
'Version' => 'Version',
'Template' => 'Template',
'Status' => 'Status',
'Tags' => 'Tags',
'TextDomain' => 'Text Domain',
'DomainPath' => 'Domain Path',
'RequiresWP' => 'Requires at least',
'RequiresPHP' => 'Requires PHP',
'UpdateURI' => 'Update URI',
);
/**
* Default themes.
*
* @since 3.4.0
* @since 3.5.0 Added the Twenty Twelve theme.
* @since 3.6.0 Added the Twenty Thirteen theme.
* @since 3.8.0 Added the Twenty Fourteen theme.
* @since 4.1.0 Added the Twenty Fifteen theme.
* @since 4.4.0 Added the Twenty Sixteen theme.
* @since 4.7.0 Added the Twenty Seventeen theme.
* @since 5.0.0 Added the Twenty Nineteen theme.
* @since 5.3.0 Added the Twenty Twenty theme.
* @since 5.6.0 Added the Twenty Twenty-One theme.
* @since 5.9.0 Added the Twenty Twenty-Two theme.
* @since 6.1.0 Added the Twenty Twenty-Three theme.
* @since 6.4.0 Added the Twenty Twenty-Four theme.
* @since 6.7.0 Added the Twenty Twenty-Five theme.
* @var string[]
*/
private static $default_themes = array(
'classic' => 'WordPress Classic',
'default' => 'WordPress Default',
'twentyten' => 'Twenty Ten',
'twentyeleven' => 'Twenty Eleven',
'twentytwelve' => 'Twenty Twelve',
'twentythirteen' => 'Twenty Thirteen',
'twentyfourteen' => 'Twenty Fourteen',
'twentyfifteen' => 'Twenty Fifteen',
'twentysixteen' => 'Twenty Sixteen',
'twentyseventeen' => 'Twenty Seventeen',
'twentynineteen' => 'Twenty Nineteen',
'twentytwenty' => 'Twenty Twenty',
'twentytwentyone' => 'Twenty Twenty-One',
'twentytwentytwo' => 'Twenty Twenty-Two',
'twentytwentythree' => 'Twenty Twenty-Three',
'twentytwentyfour' => 'Twenty Twenty-Four',
'twentytwentyfive' => 'Twenty Twenty-Five',
);
/**
* Renamed theme tags.
*
* @since 3.8.0
* @var string[]
*/
private static $tag_map = array(
'fixed-width' => 'fixed-layout',
'flexible-width' => 'fluid-layout',
);
/**
* Absolute path to the theme root, usually wp-content/themes
*
* @since 3.4.0
* @var string
*/
private $theme_root;
/**
* Header data from the theme's style.css file.
*
* @since 3.4.0
* @var array
*/
private $headers = array();
/**
* Header data from the theme's style.css file after being sanitized.
*
* @since 3.4.0
* @var array
*/
private $headers_sanitized;
/**
* Is this theme a block theme.
*
* @since 6.2.0
* @var bool
*/
private $block_theme;
/**
* Header name from the theme's style.css after being translated.
*
* Cached due to sorting functions running over the translated name.
*
* @since 3.4.0
* @var string
*/
private $name_translated;
/**
* Errors encountered when initializing the theme.
*
* @since 3.4.0
* @var WP_Error
*/
private $errors;
/**
* The directory name of the theme's files, inside the theme root.
*
* In the case of a child theme, this is directory name of the child theme.
* Otherwise, 'stylesheet' is the same as 'template'.
*
* @since 3.4.0
* @var string
*/
private $stylesheet;
/**
* The directory name of the theme's files, inside the theme root.
*
* In the case of a child theme, this is the directory name of the parent theme.
* Otherwise, 'template' is the same as 'stylesheet'.
*
* @since 3.4.0
* @var string
*/
private $template;
/**
* A reference to the parent theme, in the case of a child theme.
*
* @since 3.4.0
* @var WP_Theme
*/
private $parent;
/**
* URL to the theme root, usually an absolute URL to wp-content/themes
*
* @since 3.4.0
* @var string
*/
private $theme_root_uri;
/**
* Flag for whether the theme's textdomain is loaded.
*
* @since 3.4.0
* @var bool
*/
private $textdomain_loaded;
/**
* Stores an md5 hash of the theme root, to function as the cache key.
*
* @since 3.4.0
* @var string
*/
private $cache_hash;
/**
* Block template folders.
*
* @since 6.4.0
* @var string[]
*/
private $block_template_folders;
/**
* Default values for template folders.
*
* @since 6.4.0
* @var string[]
*/
private $default_template_folders = array(
'wp_template' => 'templates',
'wp_template_part' => 'parts',
);
/**
* Flag for whether the themes cache bucket should be persistently cached.
*
* Default is false. Can be set with the {@see 'wp_cache_themes_persistently'} filter.
*
* @since 3.4.0
* @var bool
*/
private static $persistently_cache;
/**
* Expiration time for the themes cache bucket.
*
* By default the bucket is not cached, so this value is useless.
*
* @since 3.4.0
* @var bool
*/
private static $cache_expiration = 1800;
/**
* Constructor for WP_Theme.
*
* @since 3.4.0
*
* @global array $wp_theme_directories
*
* @param string $theme_dir Directory of the theme within the theme_root.
* @param string $theme_root Theme root.
* @param WP_Theme|null $_child If this theme is a parent theme, the child may be passed for validation purposes.
*/
public function __construct( $theme_dir, $theme_root, $_child = null ) {
global $wp_theme_directories;
// Initialize caching on first run.
if ( ! isset( self::$persistently_cache ) ) {
/** This action is documented in wp-includes/theme.php */
self::$persistently_cache = apply_filters( 'wp_cache_themes_persistently', false, 'WP_Theme' );
if ( self::$persistently_cache ) {
wp_cache_add_global_groups( 'themes' );
if ( is_int( self::$persistently_cache ) ) {
self::$cache_expiration = self::$persistently_cache;
}
} else {
wp_cache_add_non_persistent_groups( 'themes' );
}
}
// Handle a numeric theme directory as a string.
$theme_dir = (string) $theme_dir;
$this->theme_root = $theme_root;
$this->stylesheet = $theme_dir;
// Correct a situation where the theme is 'some-directory/some-theme' but 'some-directory' was passed in as part of the theme root instead.
if ( ! in_array( $theme_root, (array) $wp_theme_directories, true )
&& in_array( dirname( $theme_root ), (array) $wp_theme_directories, true )
) {
$this->stylesheet = basename( $this->theme_root ) . '/' . $this->stylesheet;
$this->theme_root = dirname( $theme_root );
}
$this->cache_hash = md5( $this->theme_root . '/' . $this->stylesheet );
$theme_file = $this->stylesheet . '/style.css';
$cache = $this->cache_get( 'theme' );
if ( is_array( $cache ) ) {
foreach ( array( 'block_template_folders', 'block_theme', 'errors', 'headers', 'template' ) as $key ) {
if ( isset( $cache[ $key ] ) ) {
$this->$key = $cache[ $key ];
}
}
if ( $this->errors ) {
return;
}
if ( isset( $cache['theme_root_template'] ) ) {
$theme_root_template = $cache['theme_root_template'];
}
} elseif ( ! file_exists( $this->theme_root . '/' . $theme_file ) ) {
$this->headers['Name'] = $this->stylesheet;
if ( ! file_exists( $this->theme_root . '/' . $this->stylesheet ) ) {
$this->errors = new WP_Error(
'theme_not_found',
sprintf(
/* translators: %s: Theme directory name. */
__( 'The theme directory "%s" does not exist.' ),
esc_html( $this->stylesheet )
)
);
} else {
$this->errors = new WP_Error( 'theme_no_stylesheet', __( 'Stylesheet is missing.' ) );
}
$this->template = $this->stylesheet;
$this->block_theme = false;
$this->block_template_folders = $this->default_template_folders;
$this->cache_add(
'theme',
array(
'block_template_folders' => $this->block_template_folders,
'block_theme' => $this->block_theme,
'headers' => $this->headers,
'errors' => $this->errors,
'stylesheet' => $this->stylesheet,
'template' => $this->template,
)
);
if ( ! file_exists( $this->theme_root ) ) { // Don't cache this one.
$this->errors->add( 'theme_root_missing', __( '<strong>Error:</strong> The themes directory is either empty or does not exist. Please check your installation.' ) );
}
return;
} elseif ( ! is_readable( $this->theme_root . '/' . $theme_file ) ) {
$this->headers['Name'] = $this->stylesheet;
$this->errors = new WP_Error( 'theme_stylesheet_not_readable', __( 'Stylesheet is not readable.' ) );
$this->template = $this->stylesheet;
$this->block_theme = false;
$this->block_template_folders = $this->default_template_folders;
$this->cache_add(
'theme',
array(
'block_template_folders' => $this->block_template_folders,
'block_theme' => $this->block_theme,
'headers' => $this->headers,
'errors' => $this->errors,
'stylesheet' => $this->stylesheet,
'template' => $this->template,
)
);
return;
} else {
$this->headers = get_file_data( $this->theme_root . '/' . $theme_file, self::$file_headers, 'theme' );
/*
* Default themes always trump their pretenders.
* Properly identify default themes that are inside a directory within wp-content/themes.
*/
$default_theme_slug = array_search( $this->headers['Name'], self::$default_themes, true );
if ( $default_theme_slug ) {
if ( basename( $this->stylesheet ) !== $default_theme_slug ) {
$this->headers['Name'] .= '/' . $this->stylesheet;
}
}
}
if ( ! $this->template && $this->stylesheet === $this->headers['Template'] ) {
$this->errors = new WP_Error(
'theme_child_invalid',
sprintf(
/* translators: %s: Template. */
__( 'The theme defines itself as its parent theme. Please check the %s header.' ),
'<code>Template</code>'
)
);
$this->cache_add(
'theme',
array(
'block_template_folders' => $this->get_block_template_folders(),
'block_theme' => $this->is_block_theme(),
'headers' => $this->headers,
'errors' => $this->errors,
'stylesheet' => $this->stylesheet,
)
);
return;
}
// (If template is set from cache [and there are no errors], we know it's good.)
if ( ! $this->template ) {
$this->template = $this->headers['Template'];
}
if ( ! $this->template ) {
$this->template = $this->stylesheet;
$theme_path = $this->theme_root . '/' . $this->stylesheet;
if ( ! $this->is_block_theme() && ! file_exists( $theme_path . '/index.php' ) ) {
$error_message = sprintf(
/* translators: 1: templates/index.html, 2: index.php, 3: Documentation URL, 4: Template, 5: style.css */
__( 'Template is missing. Standalone themes need to have a %1$s or %2$s template file. <a href="%3$s">Child themes</a> need to have a %4$s header in the %5$s stylesheet.' ),
'<code>templates/index.html</code>',
'<code>index.php</code>',
__( 'https://developer.wordpress.org/themes/advanced-topics/child-themes/' ),
'<code>Template</code>',
'<code>style.css</code>'
);
$this->errors = new WP_Error( 'theme_no_index', $error_message );
$this->cache_add(
'theme',
array(
'block_template_folders' => $this->get_block_template_folders(),
'block_theme' => $this->block_theme,
'headers' => $this->headers,
'errors' => $this->errors,
'stylesheet' => $this->stylesheet,
'template' => $this->template,
)
);
return;
}
}
// If we got our data from cache, we can assume that 'template' is pointing to the right place.
if ( ! is_array( $cache )
&& $this->template !== $this->stylesheet
&& ! file_exists( $this->theme_root . '/' . $this->template . '/index.php' )
) {
/*
* If we're in a directory of themes inside /themes, look for the parent nearby.
* wp-content/themes/directory-of-themes/*
*/
$parent_dir = dirname( $this->stylesheet );
$directories = search_theme_directories();
if ( '.' !== $parent_dir
&& file_exists( $this->theme_root . '/' . $parent_dir . '/' . $this->template . '/index.php' )
) {
$this->template = $parent_dir . '/' . $this->template;
} elseif ( $directories && isset( $directories[ $this->template ] ) ) {
/*
* Look for the template in the search_theme_directories() results, in case it is in another theme root.
* We don't look into directories of themes, just the theme root.
*/
$theme_root_template = $directories[ $this->template ]['theme_root'];
} else {
// Parent theme is missing.
$this->errors = new WP_Error(
'theme_no_parent',
sprintf(
/* translators: %s: Theme directory name. */
__( 'The parent theme is missing. Please install the "%s" parent theme.' ),
esc_html( $this->template )
)
);
$this->cache_add(
'theme',
array(
'block_template_folders' => $this->get_block_template_folders(),
'block_theme' => $this->is_block_theme(),
'headers' => $this->headers,
'errors' => $this->errors,
'stylesheet' => $this->stylesheet,
'template' => $this->template,
)
);
$this->parent = new WP_Theme( $this->template, $this->theme_root, $this );
return;
}
}
// Set the parent, if we're a child theme.
if ( $this->template !== $this->stylesheet ) {
// If we are a parent, then there is a problem. Only two generations allowed! Cancel things out.
if ( $_child instanceof WP_Theme && $_child->template === $this->stylesheet ) {
$_child->parent = null;
$_child->errors = new WP_Error(
'theme_parent_invalid',
sprintf(
/* translators: %s: Theme directory name. */
__( 'The "%s" theme is not a valid parent theme.' ),
esc_html( $_child->template )
)
);
$_child->cache_add(
'theme',
array(
'block_template_folders' => $_child->get_block_template_folders(),
'block_theme' => $_child->is_block_theme(),
'headers' => $_child->headers,
'errors' => $_child->errors,
'stylesheet' => $_child->stylesheet,
'template' => $_child->template,
)
);
// The two themes actually reference each other with the Template header.
if ( $_child->stylesheet === $this->template ) {
$this->errors = new WP_Error(
'theme_parent_invalid',
sprintf(
/* translators: %s: Theme directory name. */
__( 'The "%s" theme is not a valid parent theme.' ),
esc_html( $this->template )
)
);
$this->cache_add(
'theme',
array(
'block_template_folders' => $this->get_block_template_folders(),
'block_theme' => $this->is_block_theme(),
'headers' => $this->headers,
'errors' => $this->errors,
'stylesheet' => $this->stylesheet,
'template' => $this->template,
)
);
}
return;
}
// Set the parent. Pass the current instance so we can do the checks above and assess errors.
$this->parent = new WP_Theme( $this->template, isset( $theme_root_template ) ? $theme_root_template : $this->theme_root, $this );
}
if ( wp_paused_themes()->get( $this->stylesheet ) && ( ! is_wp_error( $this->errors ) || ! isset( $this->errors->errors['theme_paused'] ) ) ) {
$this->errors = new WP_Error( 'theme_paused', __( 'This theme failed to load properly and was paused within the admin backend.' ) );
}
// We're good. If we didn't retrieve from cache, set it.
if ( ! is_array( $cache ) ) {
$cache = array(
'block_theme' => $this->is_block_theme(),
'block_template_folders' => $this->get_block_template_folders(),
'headers' => $this->headers,
'errors' => $this->errors,
'stylesheet' => $this->stylesheet,
'template' => $this->template,
);
// If the parent theme is in another root, we'll want to cache this. Avoids an entire branch of filesystem calls above.
if ( isset( $theme_root_template ) ) {
$cache['theme_root_template'] = $theme_root_template;
}
$this->cache_add( 'theme', $cache );
}
}
/**
* When converting the object to a string, the theme name is returned.
*
* @since 3.4.0
*
* @return string Theme name, ready for display (translated)
*/
public function __toString() {
return (string) $this->display( 'Name' );
}
/**
* __isset() magic method for properties formerly returned by current_theme_info()
*
* @since 3.4.0
*
* @param string $offset Property to check if set.
* @return bool Whether the given property is set.
*/
public function __isset( $offset ) {
static $properties = array(
'name',
'title',
'version',
'parent_theme',
'template_dir',
'stylesheet_dir',
'template',
'stylesheet',
'screenshot',
'description',
'author',
'tags',
'theme_root',
'theme_root_uri',
);
return in_array( $offset, $properties, true );
}
/**
* __get() magic method for properties formerly returned by current_theme_info()
*
* @since 3.4.0
*
* @param string $offset Property to get.
* @return mixed Property value.
*/
public function __get( $offset ) {
switch ( $offset ) {
case 'name':
case 'title':
return $this->get( 'Name' );
case 'version':
return $this->get( 'Version' );
case 'parent_theme':
return $this->parent() ? $this->parent()->get( 'Name' ) : '';
case 'template_dir':
return $this->get_template_directory();
case 'stylesheet_dir':
return $this->get_stylesheet_directory();
case 'template':
return $this->get_template();
case 'stylesheet':
return $this->get_stylesheet();
case 'screenshot':
return $this->get_screenshot( 'relative' );
// 'author' and 'description' did not previously return translated data.
case 'description':
return $this->display( 'Description' );
case 'author':
return $this->display( 'Author' );
case 'tags':
return $this->get( 'Tags' );
case 'theme_root':
return $this->get_theme_root();
case 'theme_root_uri':
return $this->get_theme_root_uri();
// For cases where the array was converted to an object.
default:
return $this->offsetGet( $offset );
}
}
/**
* Method to implement ArrayAccess for keys formerly returned by get_themes()
*
* @since 3.4.0
*
* @param mixed $offset
* @param mixed $value
*/
#[ReturnTypeWillChange]
public function offsetSet( $offset, $value ) {}
/**
* Method to implement ArrayAccess for keys formerly returned by get_themes()
*
* @since 3.4.0
*
* @param mixed $offset
*/
#[ReturnTypeWillChange]
public function offsetUnset( $offset ) {}
/**
* Method to implement ArrayAccess for keys formerly returned by get_themes()
*
* @since 3.4.0
*
* @param mixed $offset
* @return bool
*/
#[ReturnTypeWillChange]
public function offsetExists( $offset ) {
static $keys = array(
'Name',
'Version',
'Status',
'Title',
'Author',
'Author Name',
'Author URI',
'Description',
'Template',
'Stylesheet',
'Template Files',
'Stylesheet Files',
'Template Dir',
'Stylesheet Dir',
'Screenshot',
'Tags',
'Theme Root',
'Theme Root URI',
'Parent Theme',
);
return in_array( $offset, $keys, true );
}
/**
* Method to implement ArrayAccess for keys formerly returned by get_themes().
*
* Author, Author Name, Author URI, and Description did not previously return
* translated data. We are doing so now as it is safe to do. However, as
* Name and Title could have been used as the key for get_themes(), both remain
* untranslated for back compatibility. This means that ['Name'] is not ideal,
* and care should be taken to use `$theme::display( 'Name' )` to get a properly
* translated header.
*
* @since 3.4.0
*
* @param mixed $offset
* @return mixed
*/
#[ReturnTypeWillChange]
public function offsetGet( $offset ) {
switch ( $offset ) {
case 'Name':
case 'Title':
/*
* See note above about using translated data. get() is not ideal.
* It is only for backward compatibility. Use display().
*/
return $this->get( 'Name' );
case 'Author':
return $this->display( 'Author' );
case 'Author Name':
return $this->display( 'Author', false );
case 'Author URI':
return $this->display( 'AuthorURI' );
case 'Description':
return $this->display( 'Description' );
case 'Version':
case 'Status':
return $this->get( $offset );
case 'Template':
return $this->get_template();
case 'Stylesheet':
return $this->get_stylesheet();
case 'Template Files':
return $this->get_files( 'php', 1, true );
case 'Stylesheet Files':
return $this->get_files( 'css', 0, false );
case 'Template Dir':
return $this->get_template_directory();
case 'Stylesheet Dir':
return $this->get_stylesheet_directory();
case 'Screenshot':
return $this->get_screenshot( 'relative' );
case 'Tags':
return $this->get( 'Tags' );
case 'Theme Root':
return $this->get_theme_root();
case 'Theme Root URI':
return $this->get_theme_root_uri();
case 'Parent Theme':
return $this->parent() ? $this->parent()->get( 'Name' ) : '';
default:
return null;
}
}
/**
* Returns errors property.
*
* @since 3.4.0
*
* @return WP_Error|false WP_Error if there are errors, or false.
*/
public function errors() {
return is_wp_error( $this->errors ) ? $this->errors : false;
}
/**
* Determines whether the theme exists.
*
* A theme with errors exists. A theme with the error of 'theme_not_found',
* meaning that the theme's directory was not found, does not exist.
*
* @since 3.4.0
*
* @return bool Whether the theme exists.
*/
public function exists() {
return ! ( $this->errors() && in_array( 'theme_not_found', $this->errors()->get_error_codes(), true ) );
}
/**
* Returns reference to the parent theme.
*
* @since 3.4.0
*
* @return WP_Theme|false Parent theme, or false if the active theme is not a child theme.
*/
public function parent() {
return isset( $this->parent ) ? $this->parent : false;
}
/**
* Perform reinitialization tasks.
*
* Prevents a callback from being injected during unserialization of an object.
*/
public function __wakeup() {
if ( $this->parent && ! $this->parent instanceof self ) {
throw new UnexpectedValueException();
}
if ( $this->headers && ! is_array( $this->headers ) ) {
throw new UnexpectedValueException();
}
foreach ( $this->headers as $value ) {
if ( ! is_string( $value ) ) {
throw new UnexpectedValueException();
}
}
$this->headers_sanitized = array();
}
/**
* Adds theme data to cache.
*
* Cache entries keyed by the theme and the type of data.
*
* @since 3.4.0
*
* @param string $key Type of data to store (theme, screenshot, headers, post_templates)
* @param array|string $data Data to store
* @return bool Return value from wp_cache_add()
*/
private function cache_add( $key, $data ) {
return wp_cache_add( $key . '-' . $this->cache_hash, $data, 'themes', self::$cache_expiration );
}
/**
* Gets theme data from cache.
*
* Cache entries are keyed by the theme and the type of data.
*
* @since 3.4.0
*
* @param string $key Type of data to retrieve (theme, screenshot, headers, post_templates)
* @return mixed Retrieved data
*/
private function cache_get( $key ) {
return wp_cache_get( $key . '-' . $this->cache_hash, 'themes' );
}
/**
* Clears the cache